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Improvement of perovskite crystallinity by omnidirectional heat transfer via radiative thermal annealing

Authors
Park, JiyoonChoi, Jin WooKim, WoochulLee, RyeriWoo, Hee ChulShin, JisooKim, HyeonghunSon, Yeong JunJo, Ji YoungLee, HeonKwon, SooncheolLee, Chang-LyoulJung, Gun Young
Issue Date
2019
Publisher
ROYAL SOC CHEMISTRY
Citation
RSC ADVANCES, v.9, no.26, pp.14868 - 14875
Indexed
SCIE
SCOPUS
Journal Title
RSC ADVANCES
Volume
9
Number
26
Start Page
14868
End Page
14875
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/68999
DOI
10.1039/c9ra01309a
ISSN
2046-2069
Abstract
As promising photo-absorbing materials for photovoltaics, organic-inorganic hybrid perovskite materials such as methylammonium lead iodide and formamidinium lead iodide, have attracted lots of attention from many researchers. Among the various factors to be considered for high power conversion efficiency (PCE) in perovskite solar cells (PSCs), increasing the grain size of perovskite is most important. However, it is difficult to obtain a highly crystalline perovskite film with large grain size by using the conventional hot-plate annealing method because heat is transferred unidirectionally from the bottom to the top. In this work, we presented radiative thermal annealing (RTA) to improve the structural and electrical properties of perovskite films. Owing to the omnidirectional heat transfer, swift and uniform nuclei formation was possible within the perovskite film. An average grain size of 500 nm was obtained, which is 5 times larger than that of the perovskite film annealed on a hot-plate. This perovskite film led to an enhancement of photovoltaic performance of PSCs. Both short-circuit current density and PCE of the PSCs prepared by RTA were improved by 10%, compared to those of PSCs prepared by hot-plate annealing.
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공과대학 (신소재공학부)
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